Can we really afford this, and will the bank support it?

I would leave it as it is in the current situation. No gut feeling is needed for that, you can read it in the press every day. Bosch announced today that it will cut a further 13,000 jobs, in addition to the already decided 9,000. Bosch, a company founded in 1886, that operates in almost every sector, not just Automotive, where things are currently hitting hard...

If Bosch shakes, then the entire German industry shakes...

Leave it and be glad that you already have a finished house.